From: Trond Myklebust <trond.myklebust@fys.uio.no>
Subject: Re: Should fcntl operations check attributes with the server
	when NFS shares are mounted noac?
Date: Thu, 23 Feb 2006 11:12:13 -0500
Message-ID: <1140711133.11831.27.camel@lade.trondhjem.org>
References: <20060223124255.GA29177@hmsendeavour.rdu.redhat.com>
Mime-Version: 1.0
Content-Type: text/plain
Cc: nfs@lists.sourceforge.net
To: Neil Horman <nhorman@redhat.com>
In-Reply-To: <20060223124255.GA29177@hmsendeavour.rdu.redhat.com>
Sender: nfs-admin@lists.sourceforge.net
Errors-To: nfs-admin@lists.sourceforge.net

On Thu, 2006-02-23 at 07:42 -0500, Neil Horman wrote:
> Hey all-
> 	I've got a dillema and I'm not sure how to anwser it.  I recently had
> someone mention to me that some of the operations executed via fcntl
> (specifically F_SETLEASE was demonstrated to me) don't check the file attributes
> on the server before executing their operations.  This can lead to erroneous
> behavior in which, if someone updates file permissions or ownership from another
> node mounting an NFS share, a node attempting to do something like a F_SETLEASE
> operation will fail when it should succede, or vice versa.

Who is trying to use F_SETLEASE on an NFS share in these conditions? 

That is unbelievably borken: leases are supposed to guarantee that
nobody is changing the file. If the file is being changed on the server,
then exactly what use do they serve?

Cheers,
  Trond


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